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OOP Pillars – Java interview questions

OOP Pillars interview questions for placements and exams.

Subject: JavaDifficulty: Mixed14 questions in this set

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Java – OOP Pillars questions (14)

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1. List two practical benefits of encapsulation for large codebases.

Difficulty: EasyType: SubjectiveTopic: Encapsulation

Improves invariants and validation at a single point; reduces coupling and exposes a minimal API, easing refactoring.

2. Java supports which form(s) of inheritance for classes?

Difficulty: EasyType: MCQTopic: Inheritance

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OOP Pillars – Java interview questions

Set overview

Java – OOP Pillars questions (14)

1. List two practical benefits of encapsulation for large codebases.

2. Java supports which form(s) of inheritance for classes?

Continue your preparation

3. Which is a valid method-override change?

4. When would you prefer composition over inheritance? Name two scenarios.

5. Violating Liskov Substitution Principle (LSP) in an inheritance hierarchy most likely causes:

6. Which can make overload resolution surprising?

7. Explain how access modifiers (private/protected/public) support the OOP goals of encapsulation and modularity.

8. Which pairing is correct?

9. Which methods are NOT polymorphic via override?

10. Which best describes encapsulation in Java?

11. Differentiate compile-time and run-time polymorphism in Java with one-liners.

12. How do abstract classes and interfaces each enable abstraction? Give a crisp contrast.

13. Which statements about Java interfaces are accurate (Java 8+)?

14. What do sealed classes/interfaces (Java 17) achieve?

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OOP Pillars – Java interview questions

Set overview

1. List two practical benefits of encapsulation for large codebases.

2. Java supports which form(s) of inheritance for classes?

Continue your preparation

3. Which is a valid method-override change?

4. When would you prefer composition over inheritance? Name two scenarios.

5. Violating Liskov Substitution Principle (LSP) in an inheritance hierarchy most likely causes:

6. Which can make overload resolution surprising?

7. Explain how access modifiers (private/protected/public) support the OOP goals of encapsulation and modularity.

8. Which pairing is correct?

9. Which methods are NOT polymorphic via override?

10. Which best describes encapsulation in Java?

11. Differentiate compile-time and run-time polymorphism in Java with one-liners.

12. How do abstract classes and interfaces each enable abstraction? Give a crisp contrast.

13. Which statements about Java interfaces are accurate (Java 8+)?

14. What do sealed classes/interfaces (Java 17) achieve?

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